Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add Magnus-Gille/claude-skills --skill magnus-security-reviewgit clone --depth 1 https://github.com/Magnus-Gille/claude-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/magnus-gille/claude-skills/magnus-security-review)<a href="https://agentmods.dev/skills/magnus-gille/claude-skills/magnus-security-review"><img src="https://agentmods.dev/badge/skills/magnus-gille/claude-skills/magnus-security-review/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/magnus-gille/claude-skills/magnus-security-review"><img src="https://agentmods.dev/badge/skills/magnus-gille/claude-skills/magnus-security-review.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00045 | $0.00458 |
| Opus 5.5 | $0.00018 | $0.00183 |
| Sonnet 5.5 | $0.00009 | $0.00092 |
| Haiku 4.5 | $0.00005 | $0.00046 |
Grade A, and why
magnus-security-review scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Magnus Security Review
Run the requested review in three phases: threat model, targeted analysis, and validation/remediation. Keep findings grounded in reachable data flow and state residual uncertainty instead of manufacturing issues.
Scope and workflow
- State the repository and exact scope. Review one repository at a time.
- Read the relevant code, tests, configuration, architecture, and deployment context before scanning. For a full-repository or comprehensive review, read references/checklists.md and select the categories that apply; for a small diff, inspect only relevant categories.
- Map entry points, exits, assets, trust boundaries, and privileged operations. Summarize the likely STRIDE risks.
- Trace inputs to security-sensitive sinks and inspect classic web/API, dependency, infrastructure, CI, IAM, native-safety, and LLM risks that the scope can reach.
- Validate each candidate against reachability, guards, framework defaults, tests, and exploitability. Mark it Confirmed, Likely, or Theoretical and rate severity by impact and exploitability.
- Self-critique findings, remove noise, and propose a concrete fix. Do not claim a scanner result, deployment state, or mitigation that was not observed.
For a full review, also inspect relevant security history and sibling occurrences of past fixes. Keep temporary review artifacts out of the repository unless the user requests a durable threat model.
Output
Lead with findings ordered by severity:
# Security Review: <scope>
## Threat Model Summary
<2-3 short paragraphs>
## Findings
### [HIGH] Title - path:line
**Category:** OWASP/LLM/STRIDE
**Status:** Confirmed/Likely/Theoretical
**Attack path:** ...
**Impact:** ...
**Fix:** ...
## Discarded / False Positives
- ...
## Recommendations
- ...
If there are no confirmed or likely issues, say so clearly and state residual risk and test gaps.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago Changed · -218 lines · -18 tokens per session scan B → A f1f5ba6d8ed3
- 2mo ago First seen · 266 lines · 63 tokens per session scan B 7bc2e7d9c5a9
magnus-security-review is a skill published in the GitHub repository Magnus-Gille/claude-skills (5 stars, last pushed 2d ago), licensed MIT. It adds 45 tokens to every session and 458 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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